Lighting device



FIG. 1 is a front view of a lighting device, showing my new design;

FIG. 2 is the bottom plan view thereof;

FIG. 3 is the top perspective view thereof;

FIG. 4 is the right side view thereof;

FIG. 5 is the left side view thereof;

FIG. 6 is the rear view thereof; and,

FIG. 7 is the top plan view thereof. 

The ornamental design for a lighting device, as shown and described. 